Granted Patent
Utility
US 4,318,591 · App. 06/158,104
Polarization switched image rotator
Inventor:
Paul B. Elterman
Patented Case
View Patent ↗
Granted: Mar 9, 1982
Filed: Jun 10, 1980
Inventor
Paul B. Elterman
Assignee (at issue)
Ford Aerospace & Communications Corporation
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.